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Selenium

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Formula:
Se
System:
Trigonal
Colour:
Gray to grayish black, ...
Lustre:
Metallic
Hardness:
2
Name:
From the Greek "selene," the moon, in allusion to tellurium.

Classification of Selenium

Approved, 'Grandfathered' (first described prior to 1959)
1.CC.10

1 : ELEMENTS (Metals and intermetallic alloys; metalloids and nonmetals; carbides, silicides, nitrides, phosphides)
C : Metalloids and Nonmetals
C : Sulfur-selenium-iodine
Dana 7th ed.:
1.3.3.1
1.3.4.1

1 : NATIVE ELEMENTS AND ALLOYS
3 : Semi-metals and non-metals
1.53

1 : Elements and Alloys (including the arsenides, antimonides and bismuthides of Cu, Ag and Au)
mindat.org URL:
http://www.mindat.org/min-3611.html
Please feel free to link to this page.

Physical Properties of Selenium

Metallic
Diaphaneity (Transparency):
Opaque
Colour:
Gray to grayish black, reddish gray, red
Streak:
red
Hardness (Mohs):
2
Tenacity:
Flexible
Cleavage:
Distinct/Good
Good on {0112}
Density:
4.8 g/cm3 (Measured)    4.809 g/cm3 (Calculated)

Crystallography of Selenium

Crystal System:
Trigonal
Class (H-M):
3 2 - Trapezohedral
Space Group:
P31 2 1
Cell Parameters:
a = 4.3662Å, c = 4.9536Å
Ratio:
a:c = 1 : 1.135
Unit Cell Volume:
V 81.78 ų (Calculated from Unit Cell)
Z:
3

Crystallographic forms of Selenium

Crystal Atlas:
Image Loading
Click on an icon to view
Selenium - {100}, {101}
3d models and HTML5 code kindly provided by www.smorf.nl.

Toggle
Edge Lines | Miller Indicies | Axes

Transparency
Opaque | Translucent | Transparent

View
Along a-axis | Along b-axis | Along c-axis | Start rotation | Stop rotation
X-Ray Powder Diffraction:
Image Loading

Radiation - Copper Kα
Data Set:
Data courtesy of RRUFF project at University of Arizona, used with permission.

Optical Data of Selenium

Type:
Uniaxial (+)
RI values:
nω = 3.000 nε = 4.040
Max Birefringence:
δ = 1.040
Image shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:
Very High
Type:
Anisotropic
Anisotropism:
Very strong
Colour in reflected light:
white in air, darker white to grayish brown in oil red in transmitted light
Pleochroism:
Visible
Comments:
Cream-white to brown

Chemical Properties of Selenium

Formula:
Se
All elements listed in formula:
Common Impurities:
S

Relationship of Selenium to other Species

1.1CopperCu
1.2SilverAg
1.5GoldAu
1.6AuricuprideCu3Au
1.7Tetra-auricuprideAuCu
1.8ZincZn
1.9CadmiumCd
1.10DanbaiteCuZn2
1.11ZhanghengiteCuZn
1.12MercuryHg
1.13KolymiteCu7Hg6
1.14MoschellandsbergiteAg2Hg3
1.15EugeniteAg11Hg2
1.16SchachneriteAg1.1Hg0.9
1.17ParaschachneriteAg3Hg2
1.18LuanheiteAg3Hg
1.19Weishanite(Au,Ag)3Hg2
1.20IndiumIn
1.21AluminiumAl
1.22Khatyrkite(Cu,Zn)Al2
1.23Cupalite(Cu,Zn)Al
1.24DiamondC
1.25GraphiteC
1.26ChaoiteC
1.27LonsdaleiteC
1.28SiliconSi
1.29TinSn
1.30LeadPb
1.31AnyuiiteAuPb2
1.31NovodnepriteAuPb3
1.32LeadamalgamPb0.7Hg0.3
1.33ArsenicAs
1.34ArsenolampriteAs
1.35PaxiteCuAs2
1.36KoutekiteCu5As2
1.37DomeykiteCu3As
1.38Algodonite(Cu1-xAsx)
1.39NovákiteCu20AgAs10
1.40KutinaiteAg6Cu14As7
1.41AntimonySb
1.42StibarsenAsSb
1.43ParadocrasiteSb3As
1.44HorsforditeCu, Sb
1.45CuprostibiteCu2(Sb,Tl)
1.46Allargentum(Ag1-xSbx)
1.47AurostibiteAuSb2
1.48DyscrasiteAg3Sb
1.49BismuthBi
1.50MaldoniteAu2Bi
1.51SulphurS8
1.52RosickýiteS
1.54TelluriumTe
1.55ChromiumCr
1.56RheniumRe
1.57IronFe
1.58ChromferideFe3Cr1-x (x=0.6)
1.59FerchromideCr3Fe1-x
1.60WairauiteCoFe
1.61NickelNi
1.62Kamacite(Fe,Ni)
1.63Taenite(Fe,Ni)
1.64TetrataeniteFeNi
1.65AwaruiteNi3Fe
1.66Palladium(Pd,Pt)
1.67PotaritePdHg
1.68PaolovitePd2Sn
1.69Stannopalladinite(Pd,Cu)3Sn2
1.70CabriitePd2CuSn
1.71Taimyrite-I(Pd,Cu,Pt)3Sn
1.72Atokite(Pd,Pt)3Sn
1.73Rustenburgite(Pt,Pd)3Sn
1.74Zvyagintsevite(Pd,Pt,Au)3(Pb,Sn)
1.75PlumbopalladinitePd3Pb2
1.76Osmium(Os,Ir,Ru)
1.77Iridium(Ir,Os,Ru)
1.82PlatinumPt
1.83HongshiitePtCu
1.84NiggliitePtSn
1.85IsoferroplatinumPt3Fe
1.86TetraferroplatinumPtFe
1.87TulameenitePt2CuFe
1.88FerronickelplatinumPt2FeNi
1.89Rhodium(Rh,Pt)

Other Names for Selenium

Name in Other Languages:
Afrikaans:Selenium
Armenian:Սելեն
Azeri:Selen
Basque:Selenio
Belarusian:Селен
Bosnian (Latin Script):Selen
Bulgarian:Селен
Catalan:Seleni
Corsican:Seleniu
Croatian:Selenij
Czech:Selen
Danish:Selen
Dutch:Seleen
Esperanto:Seleno
Estonian:Seleen
Finnish:Seleeni
French:Sélénium
Friulian:Seleni
Galician:Selenio
Haitian:Selenyòm
Hungarian:Szelén
Icelandic:Selen
Indonesian:Selenium
Irish Gaelic:Seiléiniam
Italian:Selenio
Javanese:Selenium
Korean:셀레늄
Latin:Selenium
Latvian:Selēns
Lithuanian:Selenas
Lojban:lurcmu
Low Saxon:Selen
Luxembourgish:Selen
Macedonian:Селен
Norwegian (Bokmål):Selen
Norwegian (Nynorsk):Selen
Occitan:Selèni
Persian:سلنیوم
Polish:Selen
Portuguese:Selênio
Quechua:Silinyu
Romanian:Seleniu
Russian:Селен
Serbian (Cyrillic Script):Селен
Serbo-Croatian:Selen
Sicilian:Sileniu
Simplified Chinese:自然硒
Slovak:Selén
Slovenian:Selen
Spanish:Selenio
Swahili:Seleni
Swedish:Selen
Turkish:Selenyum
Ukrainian:Селен
Uzbek (Latin Script):Selen
Vietnamese:Selen
Welsh:Seleniwm

Other Information

Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for Selenium

Reference List:
Palache, Charles (1934) Contributions to crystallography; claudetite, minasragrite, samsonite, native selenium, indium. American Mineralogist: 19: 194-205.

Palache, C., Berman, H., Frondel, C. (1944), The System of Mineralogy of James Dwight Dana and Edward Salisbury Dana Yale University 1837-1892, Volume I: Elements, Sulfides, Sulfosalts, Oxides. John Wiley and Sons, Inc., New York. 7th edition, revised and enlarged, 834pp.: 136-137.

Acta Crystallographica (1953) 71.

Avilov, A.S., Imamov, R.M. (1969) The structure of selenium. Soviet Physics - Crystallography: 14: 259-260.

Internet Links for Selenium

Localities for Selenium

map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.
Mineral and/or Locality  
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